Kudu has the best avatar on the entire forums. Don't question it--accept it.
Now then, Battletoads seriously made me weep. I was able to get as far as the "outrace a giant spinning orb" stage, but the orb always caught up to me. Insta-kill! I'm not even sure you CAN beat that level without a cheat device. The game was fun as hell until that point, though. There's something to be said for tough-as-nails games that require memorization and precision to get through. I've always hoped that either Battletoads or Battlemaniacs would hit the Virtual Console...